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Q:

Check Gauges light on 2001 Chevrolet Blazer

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The temperature gauge rises and falls while the truck takes awhile to blow warm air from the heater and when it does their is a smell of antifreeze.
(1) Answer
sounds like the coolant is low causing the temp to vary. have it checked for leaks and get a bid. from your description, it sounds like the heater core.

Roy